New warnings in iOS 9: "all bitcode will be dropped"

Your library was compiled without bitcode, but the bitcode option is enabled in your project settings. Say NO to Enable Bitcode in your target Build Settings and the Library Build Settings to remove the warnings.

For those wondering if enabling bitcode is required:

For iOS apps, bitcode is the default, but optional. For watchOS and tvOS apps, bitcode is required. If you provide bitcode, all apps and frameworks in the app bundle (all targets in the project) need to include bitcode.

https://help.apple.com/xcode/mac/current/#/devbbdc5ce4f

After Xcode 7, the bitcode option will be enabled by default. If your library was compiled without bitcode, but the bitcode option is enabled in your project settings, you can:

1. Update your library with bit code,
2. Say NO to Enable Bitcode in your target Build Settings

And the Library Build Settings to remove the warnings.

For more information, go to documentation of bitcode in developer library.

And WWDC 2015 Session 102: "Platforms State of the Union"

In my case for avoiding that problem:

1. Be sure that you are dealing with Xcode 7, NOT lower versions. In lower version this flag does not exist.

2. Setup: Project>Build Settings>All>Build Options>Enable Bitcode = NO